Shining Resonance features a fairly intricate upgrade system that clearly focuses on the uniqueness of your party's armaments. The characters in the game use Armonics, weapons that double as musical instruments. As such, you can "tune" your weapons with different attribute and statistical elements. Each Tuning has a proficiency level attached and slots for skill bonuses, giving rise to lots of customization opportunities. You could, for example, upgrade a character's maximum HP with a skill slot or give them a chance to put enemies to sleep in combat.